The 3rd Edition mandates clear separation between panels rated for (≥5 kA) and low-fault (<5 kA) applications. The method for determining SCCR now requires a "series combination" approach using tested component combinations.
UL 508A 3rd Edition is a foundational safety standard for industrial control panels (ICPs) in North America, focusing on design, construction, and component selection. Published in April 2018 and fully effective as of July 1, 2020, this edition represents a modernization effort to align with other safety codes like National Electrical Code (NEC) Key Highlights & Changes Alignment with NFPA 79 Ul 508a 3rd Edition Pdf